X-rays generally have energy and a frequency.
a. low; low
b. low; high
c. high; low
d. high; high

D

X-rays generally have high energy and a high frequency.

Explanation:

High-energy X-rays or HEX-rays are very hard X-rays, with typical energies of 80–1000  keV (1 MeV), about one order of magnitude higher than conventional X-rays (and well into gamma-ray energies over 120 keV).

Radio waves have much longer wavelengths and lower frequencies than do visible light waves. In contrast, X-rays have much shorter wavelengths and higher frequencies. Likewise, red light has a longer wavelength than blue light. We can also think of light as consisting of particles or packets on information that we call photons.

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